Liquid pack with areas of low adhesion

Abstract

Described is a pack comprising a carrier material such as for example cardboard, which is coated with a thermoplastic material, for liquids, comprising a tube with a bottom and a cover which has a pouring spout, in the sealing region of which are disposed, beside sealing areas with a high adhesive force, sealing areas with a low adhesive force for the purpose of peeling the sealing areas apart. In order not to be dependent on agents which impair the sealing effect and on the disposition thereof on certain regions in the cover, and in order for the tooling to be simplified, the invention provides that the sealing area (40') with a low adhesive force is formed by a pattern of raised surfaces (6) which alternate with areas (5) disposed therebeside and at a lower level. In the apparatus, there is provided an impressing roller with counter-pressure roller, wherein a line, disposed on the web of pack material, of successively disposed sealing areas can be passed through between the rollers, in the direction of movement of the web.

We claim: 
     
       1. A container, which comprises a container body, a container bottom at a first end of said container body, means for closing said container at a second end of said container body, and means for sealing said closing means, said sealing means comprising regions of high adhesive force and low adhesive force, the regions of low adhesive force comprising two surfaces each having raised and lowered portions adjacent to and alternate with one another to form a pattern, said raised and lowered portions adhering to one another when the closing means is sealed. 
     
     
       2. The container of claim 1 including a spout which is opened by opening the sealing means in the regions of low adhesive force, said container being formed from a cardboard coated with a thermoplastic material. 
     
     
       3. The container of claim 1 wherein the pattern of raised and lowered portions comprises a plurality of spaced ribs which alternate with smaller juxtaposed structures. 
     
     
       4. The container of claim 3 wherein the spaced ribs form the raised portions and the smaller juxtaposed structures form the lowered portions. 
     
     
       5. The container of claim 3 wherein the juxtaposed structures form the raised portions and the spaced ribs form the lowered portions. 
     
     
       6. The container of claim 3 wherein the pattern of smaller juxtaposed structures having a cornered configuration. 
     
     
       7. The container of claim 3 wherein the pattern of smaller juxtaposed structures have a rounded configuration. 
     
     
       8. The container of claim 3 wherein the sealing area of low adhesive force is located on the spout. 
     
     
       9. The container of claim 8 wherein at least one of the low adhesive force surfaces on the spout includes means for preventing said surfaces from clinging together after the container is reclosed. 
     
     
       10. The container of claim 9 wherein the means for preventing opened surfaces from clinging together after reclosing the container comprises a cut-away of at least a portion of one of the surfaces having low adhesive force. 
     
     
       11. The container of claim 2 including fold lines located in the regions of low adhesive force disposed on inclined surfaces. 
     
     
       12. The container of claim 11 wherein the fold lines run substantially perpendicular and intersect with the spout.